BioMysteryBench - Human Difficult (original problem set)
Science
BioMysteryBench Human Difficult as reported before July 2026, before Anthropic removed 6 problems from this subset on external feedback. Scores on the original set are not comparable to the revised subset. Diagnostic because the set was superseded.
Top models (higher is better)
| Model | Score |
|---|---|
| Claude Fable 5 | 46.1 |